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• W2035589996 abstract "We report identification of the radio-loud narrow-line quasar SDSS J172206.03+565451.6, which we found in the course of a search for radio-loud narrow-line active galactic nuclei (AGNs). SDSS J172206.03+565451.6 is only about the fourth securely identified radio-loud narrow-line quasar and the second-most radio loud, with a radio index R1.4 ≈ 100-700. Its black hole mass, MBH (2-3) × 107 M☉ estimated from Hβ line width and 5100 A luminosity, is unusually small given its radio loudness, and the combination of mass and radio index puts SDSS J172206.03+565451.6 in a scarcely populated region of MBH-R diagrams. SDSS J172206.03+565451.6 is a classical narrow-line Seyfert 1-type object with FWHMHβ 1490 km s-1, an intensity ratio of [O ]/Hβ 0.7, and Fe II emission complexes with Fe λ4570/Hβ 0.7. The ionization parameter of its narrow-line region, estimated from the line ratio [O ]/[O ], is similar to Seyferts, and its high ratio of [Ne ]/[Ne ] indicates a strong EUV-to-soft X-ray excess. We advertise the combined usage of [O ]/[O ] and [Ne ]/[Ne ] diagrams as a useful diagnostic tool to estimate ionization parameters and to constrain the EUV-soft X-ray continuum shape relatively independently from other parameters." @default.
• W2035589996 created "2016-06-24" @default.
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• W2035589996 date "2006-03-10" @default.
• W2035589996 modified "2023-09-27" @default.
• W2035589996 title "The Radio‐Loud Narrow‐Line Quasar SDSS J172206.03+565451.6" @default.
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• W2035589996 doi "https://doi.org/10.1086/499764" @default.
• W2035589996 hasPublicationYear "2006" @default.
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